ac:custom-content:search-body content property is not being indexed by the search

Issue Summary

The ac:custom-content:search-body content property used by custom contents is not being indexed by the search mechanism anymore.

Steps to Reproduce

1. Create a custom content such as a draw.io or gliffy diagram
2. Save the diagram and publish the page
3. Search for the diagram by filtering by its type and copy its ID
4. Access

   https://instance.atlassian.net/wiki/rest/api/content/CONTENT_ID/property/ac:custom-content:search-body

5. Perform a new search using the terms returned by that property

Expected Results

The search should return the custom content (in this case the diagram)

Actual Results

Nothing is found

Workaround

Currently there is no known workaround for this behavior. A workaround will be added here when available